'\" t
.\"     Title: region_intersects
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Hardware Interfaces
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "REGION_INTERSECTS" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Hardware Interfaces"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
region_intersects \- determine intersection of region with known resources
.SH "SYNOPSIS"
.HP \w'int\ region_intersects('u
.BI "int region_intersects(resource_size_t\ " "start" ", size_t\ " "size" ", unsigned\ long\ " "flags" ", unsigned\ long\ " "desc" ");"
.SH "ARGUMENTS"
.PP
\fIstart\fR
.RS 4
region start address
.RE
.PP
\fIsize\fR
.RS 4
size of region
.RE
.PP
\fIflags\fR
.RS 4
flags of resource (in iomem_resource)
.RE
.PP
\fIdesc\fR
.RS 4
descriptor of resource (in iomem_resource) or IORES_DESC_NONE
.RE
.SH "DESCRIPTION"
.PP
Check if the specified region partially overlaps or fully eclipses a resource identified by
\fIflags\fR
and
\fIdesc\fR
(optional with IORES_DESC_NONE)\&. Return REGION_DISJOINT if the region does not overlap
\fIflags\fR/\fIdesc\fR, return REGION_MIXED if the region overlaps
\fIflags\fR/\fIdesc\fR
and another resource, and return REGION_INTERSECTS if the region overlaps
\fIflags\fR/\fIdesc\fR
and no other defined resource\&. Note that REGION_INTERSECTS is also returned in the case when the specified region overlaps RAM and undefined memory holes\&.
.PP
\fBregion_intersect\fR
is used by memory remapping functions to ensure the user is not remapping RAM and is a vast speed up over walking through the resource table page by page\&.
.SH "COPYRIGHT"
.br